As commandant of Auschwitz from 1940 to 1943, Rudolf Franz Ferdinand Höss was single-handedly responsible for turning it into the Nazis’ largest death camp. Keystone-France/Gamma-Keystone via Getty Images Rudolph Höss during his trial in Warsaw, Poland. March 31 1947. In his testimony during the Nuremberg trials, Auschwitz commandant Rudolf Höss described his relief at finding an efficient way to kill. The deadly gas Zyklon B, he explained, “set my mind at rest, for the mass extermination of the Jews was to start soon… Now we had the gas, and we had established a procedure.” A longtime Nazi, Höss took over...